This is exactly why this site shouldn't be used for pre-releases. Most of the questions will be irrelevant after a short time, but they will stay here, taking up time.
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Jo-Erlend SchinstadSep 13 '11 at 8:36

Ok, this seems to be a known bug: [bugs.launchpad.net/unity/+bug/754095]. I'd still be happy to know if there is any workaround that currently work, as I have to setup a computer for an inexperienced person, and this evolution shortcut will be confusing (since she will use webmail).
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drakmanisoApr 14 '11 at 18:10

It looks like only thunderbird cannot be added as favorite. Try another mailing program or wait until the bug gets fixed :) Maybe there's a workaround, but I don't know one yet.
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omnidanApr 14 '11 at 18:14

It's not only thundebird, as this does not work with GMail, nor Claws. I think the sortcut is fixed to evolution...
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drakmanisoApr 14 '11 at 18:59

You could always remove Evolution from Synaptic Package Manager and install Thunderbird, but install it via Ubuntu Tweak. I recommend that way because when I compiled Thunderbird from .tar.bz2 and installed it correctly the Thunderbird icon would not appear in the dash even after I restarted the PC to make sure.

Warning

When you go to Synaptic Package Manager, do not remove Evolution Data Server Common as that will uninstall the Ubuntu Desktop and a few other things that are essential.